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alignContent alignItems alignSelf animation animationDelay animationDirection animationDuration animationFillMode animationIterationCount animationName animationTimingFunction animationPlayState background backgroundAttachment backgroundColor backgroundImage backgroundPosition backgroundRepeat backgroundClip backgroundOrigin backgroundSize backfaceVisibility border borderBottom borderBottomColor borderBottomLeftRadius borderBottomRightRadius borderBottomStyle borderBottomWidth borderCollapse borderColor borderImage borderImageOutset borderImageRepeat borderImageSlice borderImageSource borderImageWidth borderLeft borderLeftColor borderLeftStyle borderLeftWidth borderRadius borderRight borderRightColor borderRightStyle borderRightWidth borderSpacing borderStyle borderTop borderTopColor borderTopLeftRadius borderTopRightRadius borderTopStyle borderTopWidth borderWidth bottom boxShadow boxSizing captionSide clear clip color columnCount columnFill columnGap columnRule columnRuleColor columnRuleStyle columnRuleWidth columns columnSpan columnWidth counterIncrement counterReset cursor direction display emptyCells filter flex flexBasis flexDirection flexFlow flexGrow flexShrink flexWrap cssFloat font fontFamily fontSize fontStyle fontVariant fontWeight fontSizeAdjust height isolation justifyContent left letterSpacing lineHeight listStyle listStyleImage listStylePosition listStyleType margin marginBottom marginLeft marginRight marginTop maxHeight maxWidth minHeight minWidth objectFit objectPosition opacity order orphans outline outlineColor outlineOffset outlineStyle outlineWidth overflow overflowX overflowY padding paddingBottom paddingLeft paddingRight paddingTop pageBreakAfter pageBreakBefore pageBreakInside perspective perspectiveOrigin position quotes resize right tableLayout tabSize textAlign textAlignLast textDecoration textDecorationColor textDecorationLine textDecorationStyle textIndent textOverflow textShadow textTransform top transform transformOrigin transformStyle transition transitionProperty transitionDuration transitionTimingFunction transitionDelay unicodeBidi userSelect verticalAlign visibility width wordBreak wordSpacing wordWrap widows zIndex
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CSSStyleDeclaration JS Conversion


Image alt Property

❮ Image Object

Example

Return the alternate text of an image:

var x = document.getElementById("myImg").alt;
Try it Yourself »

Definition and Usage

The alt property sets or returns the value of the alt attribute of an image.

The required alt attribute specifies an alternate text for an image, if the image for some reason cannot be displayed (because of slow connection, an error in the src attribute, or if the user uses a screen reader).

Note: Internet Explorer displays the value of the alt attribute as a tooltip when mousing over the <img> element. This is NOT the correct behavior, according to the HTML specification. All other browsers are following the specification, and will only display the alt text if the image cannot be displayed.

Tip: If you want to create a tooltip for an image, use the global title attribute.


Browser Support

Property
alt Yes Yes Yes Yes Yes


Syntax

Return the alt property:

imageObject.alt

Set the alt property:

imageObject.alt = text

Property Values

Value Description
text Specifies an alternate text for an image.

Guidelines for the alt text:
  • The text should describe the image if the image contains information
  • The text should explain where the link goes if the image is inside an <a> element
  • Use alt="" if the image is only for decoration

Technical Details

Return Value: A String, representing the alternate text of the image

More Examples

Example

Change the alternate text of an image:

document.getElementById("myImg").alt = "newAlternateText";
Try it Yourself »

Related Pages

HTML reference: HTML <img> alt attribute


❮ Image Object